Rock-drill.



W. A. SMITH.

B OCK DRILL.

APPLICATION ELLED 1150.15, 191s.

Patented 'May 28, 1918.

4 SHEETS-SHEET l..

W. A. SMITH.

ROCK DRILL.

APPLICATION FILED Dime. I9I5.

Patented May 28,1918.

4 SHEETS-SHEET 2.

VV. A. SMITH.

ROCK DRILL.

APPLICATION FILED 050.16. IeIe.

1 ,267,705, PatentedA May 28, I9I8.

4 SHEETS-SHEET 3.

W. A. SMITH.

ROCK DRiLL.

APPLICATIN FILED Dsc.16,\9|6.

Patented May 28, 1918.

4 SHEETS-SHEET 4.

4 L /7 /M .l fl /1 n @L i-- MUMMHVr x f I. -l ii x l wb \wy m7 Nm,

WILLIAM A. SMITH, OF DENVER, COLORADO, ASSIGNOR TO THE DENVER ROCKDRILL MANUFACTURING COMPANY, OE DENVER, COLORADO, A CORPORATION F DELA- WARE.

Boex-DRILL.

Specification of Letters Patent.

rate'ntea May as, isis.

To all whom t may concern:

Be it known that I, WILLIAM A. SMITH, a Acitizen of the United States, 4residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification.

The present invention relates to rock drills, and one of the primary objects is to provide means whereby the controlling motor is moved to its work prior to being thrown into operation, the actuation of the :motorbeing automatically effected when the same has been thus moved and properly positioned.

A further object is to improve certain structural features, as will be hereinafter more fully pointed out.

In the drawings:

Figure 1 is a view in elevation of the drill,

Figs. 2, 3 and 4 are sectional views therethrough on a scale of sufficient size to illustrate the details,

Fig. 5 is a cross sectional view on the line 5-5 of Fig. 2,

Fig. 6 is a cross sectional View on the line 6-6 of Fig. 2,

Fig. 7 is a cross sectional view on the line 7-7 of Fig 3,

Fig. 8 is a cross sectional view on the line 8-8 of Fig. s,

Fig. 9 is a detail rear elevation of the head block, with .the rearwardly extending tube in cross section and taken substantially on the line 9 9 ofvFig. 3,

Fig. 10 is a detail longitudinal sectional view at right angles to Fig. 3, and illustrating the manner of clamping the parts togetherby the side bolts of the motor,

Fig. 11 is a detail sectional view illustrating the means for securing the hammer piston against rotation,

Fig. 12 is a detail sectional view through a portion of the cylinder member and hammer piston illustrating the relation of the motive uid supply ports.

Similar reference numeralsdesignate corresponding parts in all the gures of the drawings.

In the embodiment illustrated, a motor 13 of thev hammer type is employed, which is connected to. extensible fluid-operated feeding means, designated generally lil.A

The motor 13 comprises a cylinder mem ber 15 having a reciprocatory hammer piston 16 therein, this hammer piston operating against a tappet 17 mounted in the front head 18 of the cylinder member, and said front head is provided with a suitable chuck to receive a drill bit, a portion of which is shown at 19. The drill bit is provided with the usual bore 20 through which cleansing fluid is delivered to the inner end of the drill hole.

The motive fluid supply passage for the motor 13 is shown at 21, being formed longitudinally in one wall of the cylinder member 15, and having lateral branches 22 which open through ports 23 into opposite sides of the cylinder wall. Theseports are in constant communication with longitudinal channels 24 formed in the opposite sides of the hammer piston 16, and terminating short of the ends thereof, said channels having their ends alternately brought into communication with pockets 25 formed in the cylinder walls in line with said channels. Exhaust ports 26 open through the cylinder walls and communicate with an exhaust passage 27 that is open to the atmosphere. In order to secure the hammer piston against rotation or 0scillation, and thus maintain the channels 24 in proper relation to the ports 23 and pockets 25, the said hammer piston is provided with a longitudinal keyway 28 terminating short of one end of the piston hammer and engaged by a feather or key 29 secured in the cylinder wall.

The rear end of the cylinder member is closed by a head block 30 to which is coupled the Huid-operated feeding means 14. As shown, this feeding means includes an inner tubular piston member 31 and an outer cylinder member 32 slidably telescoped therewith. The member 31, has its inner end slidably fitted within a collar portion 33 projecting rearwardly fromthe head block 30, said end having an outstanding flange 34: abutted against said collar portion. A sleeve 35 fits over the collar portion and Harige, and has an inturned shoulder portion 36 abutted against the flange. For the purpose olf rotating the drill, a rotating motor is shown at 3T, and its shaft 38has a worm drive engagement 39 with a worm gear 40 formed upon a sleeve ll that. surrounds the piston member 3l. lt is believed to be unnecessary to go into detail regarding the drill rotating motor, the same having the general characteristics of the structure disclosed in Patent, blo. 1,196,042, dated August 29, 1916. 'lhe sleeve 4l has a hanged end 42 abutted against the rear end 35 of the sleeve. rl`he various parts are held in assembled relation by side bolts 43 engaged with the front head 18 of the motor, and passing through the sleeve 35 and the ange` 42 of the sleeve el. 'lhe outer end of the piston member 3l terminates in a piston head 4e, the tubular portion of said piston member being'spaced from the surrounding cylinder member 32, and thehead le having passageways l5 which permit the passage of duid past said head.

Motive duid to operate the feeding means and the hammer is supplied from any suitable source, through a hose line 46 which is coupled to a head '47 formed upon the inner end of the cylinder member, said hose line having communication with a valve chamber 48 formed in a valve casing t9 that is located on one side ot' said head. From this valve chamber 48, a passageway 50 opens into the cylinder member 32,*said passageway being controlled by va tapered throttle valve 5l rotatably mounted in the chamber, and having an exposed operating handle 52. The said throttle valve has a bore 53 in constant communication with the :duid supply hose 46, and has a lateral port 5t movable into and out of communication with the port 50. lt will thus be seen that when the valve 5l is opened, motive :duid will pass into the cylinder 82, around the piston member 3l and through the passageways a5, so as to operate against the rear end of the piston head all.. JThis will cause said piston member to move upwardly and carry the motor and drill bit with it. The duid will also hnd its way through the head lill, which as shown in li'ig. 4, is hollow, and thus enter the interior of the pis- 'ton member 3l. The head block 30 is provided with a passageway 55 having an 0E- setportion having an internal ange 55 constituting a tubular valve seat, and a pocket 57 is alined with said odset portion. Arranged in this passageway and coperating with the valve seat 56 is a plunger valve 58 which slides into and out of the seat 5G and is yieldingly held in cooperation with said seat 56 by a coiled spring 59 bearing thereagainst. The movement ci the plunger valve under the action oil the spring 59 is 'i' .w '2 'l i limited by a plug 80 threaded into tne nead Connected to the bloclr, said plunger valve having a nose 61 that abuts against the inner' end of the plug. i

This plug also adords means for permitting access to the valve and its removal and replacement as will be evident by reference to Fig. `8.

'lhe valve in question is arranged 'to resist the passage ot Huid from means to the motor, which duid, it will be observed, is directly against the end face of the valve, and the valve 59 is so proportioned that said valve will not open until a predetermined pressure of motive fluid is brought against it.

To describe the operation of the structure as thus far explained, it may be stated that the valve 58 is set to resist a substantial pressure, say up to forty pounds, which pressure is suilcient to actuate the extensible feeding means. Assuming that the pressure of the motive Huid in the hose line t6 is at eighty pounds, it will be evident that it the throttle valve "is turned slowly to admit duid to the feeding means, 'the rst ac tion will be to extend. said feeding means and thus carry the motor and drill bit to their work. Motive duid is, however, cut od' from the motor by the said automatic plunger valve 58. When the pressure in the duid operated feeding means rises above forty pounds, said pressure will overcome the resistance of the spring 59, and the valve will be slightly motive duid to the hammer piston, and causing its actuation. The force of the blows of such hammer piston, however, de-

the feeding" opened, thereby admitting pende on the amount of air admitted by the throttle valve 5l and the consequent action ci? the piston valve.

The outer end of the feed cylinder meinber 32 is provided with a head 62 having a spur 63 to engage a support or abutment, and also having a means 4tor connecting thereto a liquid supply pipe 64. 'lhis pipe has communication with a passageway 65 ormedin the head 62, and threaded into said passageway, is a plug 66 having a bore 67 communicating with the passageway.

plug 66 is a liquid conducting tube 68 that extends` longitudinally into the feeding means and is slidably telescoped with another tube 69 that enters the same. A suitable packing gland 70 prevents leakage past the joint between the two tubes.

forwardly-extending llt the bore 2G- ot the drill bit 19. lnterposed y Z1 and 75 or thetubes between the hanges is a packing washer 76 having a bore 77 that affords communication between the tubes. A securin plug 78 is threaded into the socket, said plug surrounding the tube 69 and bearing against the ange 71 thereof. This plug, as will be evident, holds the tubes in place and is itself held against disengagement by a locking pin 79. With this arrangement, it will be evident that a cleansing liquid can be passed through the feeding means and motor to the drill bit. This particular arrangement involves certain structural improvements on Patent, No. 1,203,284, dated October2p1,1916.

The piston head 44 is provided with a bore 80 through which the tube 68 passes, and in which the plug 66 enters when the feeding means is in contracted condition. This bore is provided with a recessed portion 81 that is detachably engaged by a spring ring 82 mounted on the plug and servin to hold the parts against acci ental extension.

For the purpose of lubricating the apparatus, a portion of the head block 30 is chambered, as shown at 83 and is provided with a port 84 communicating with the interior of the piston member 31 and a port 85 in communication with the passageway 55. Aremovable plu 86 affords communication with the chamer 83 to supply lubricant thereto. With this arrangement, lubricant will iiow slowly from the chamber into the passageway 55, and be distributed by the motive fluid throughout the operating mechanism.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In apparatus of the character set forth, the combination with a motor, of a rear head lblock therefor having a rearwardly extending collar, extensible feeding means for the motor, including a member fitting within the collar and having an outstanding stop flange arranged at the end thereof, a sleeve litting over the collar and flange and having an inset shoulder overlying said flange, and means for securing the sleeve on the collar and thereby retaining said member in place.

2. In apparatus of the character set forth, the combination with a motor, of a rear head block therefor having a rearwardly extending collar, extensible feeding means for the motor, including a member fitting within the collar and having an outstanding stop flange arranged at the end thereof, a sleeve fitting over the collar and ange and having an inset shoulder overlying said flange, and side bolts for the motor engaged with the sleeve to hold the same and thereby the member in place.

3. In apparatus of the character set forth, the combination with a motor, of a rear head block therefor having a rearwardly extending collar, extensible feeding means for the motor, including a member fitting within the collar and having an outstanding stop flange arranged at the end thereof, a sleeve tting over the collar and flange and having an inset shoulder overlying said flange, a drill rotating motor including a sleeve abutted against the first sleeve, andside bolts for the motor engaged with the sleeves to hold the same and thereby the member in place.

4. In apparatus of the character set forth, the combination with a motor, of extensible feeding means therefor, a head block interposed betweenthe two and having a socket, oppositely extending fluid tubes respectively projecting into the motor and feeding means, and having their ends located in the socket, and clamping means securing said ends in said socket.

5. In apparatus of the character set forth, the combination with a motor, of extensible feeding means therefor, a head block interposed between the two and having a socket, oppositely extending fluid conducting tubes respectively projecting into the motor and feeding means and having their flanged ends located in the socket, packing interpos'ed between the flanges, and means for securing the ends in the socket.

6. In apparatus of the character set forth, the combination with a motor, of extensible feeding means therefor, a head block interposed between the two and having a socket, oppositely extending uid conducting tubes respectively projecting into the motor and feeding means and having flanged ends located in the socket, a packing washer interposed between the flanges and having a bore to afford communication between the tubes, and a nut located in the socket and holding the tubes in placel 7. In apparatus of the character set forth, the combination with a motorz of extensible feeding means therefor comprising an inner piston member connected to the motor and an outer cylinder member slidable thereon and having an outer end for abutment against a support, said outer end having an inwardly extending stem element and the piston member having a tubular portion to surround and receive the stem element when the parts are in contracted relation, and interlocking means carried by said stem element and tubular portion to hold the parts in contracted relation.

8. ln apparatus of tlie @hemel-,eis set` forths the combination with 'a motor, of extensible feeding means therefor comprising telescoping members, one of which( is attaehecl to the motor, the other having an outer end for ebutment against e support, e, cleansing fluid tube extending longitudinally in the eecling means and cmaected to saicl abutment end, and ineens mounted on the tube amd cletachably engaging the iner member. for l@ holding the feeding means in contmctefl relation.

ln testimony whereof, ax my signature in the presence .of two Witnesses.

WLLAl/ A. SMLTH. Witnesses:

D, E. Samsom; JAS. ELMENDORF. 

